Kinetics of Os(VIII) and Mn(VII) Catalysed Oxidation of Thiocyanate by Periodate in Alkaline Medium

Abstract

The kinetics of oxidation of thiocyanate with periodate in presence of
permanganate and Os (VIII) as catalysts has been studied. The reactions
are found to be zero order in oxidant, first order in MnO₄^- /Os(VIII), first
order in substrate, independent of alkali in MnO₄^- catalysed reactions, while
it is of fractional order in alkali in Os(VIII) catalysed reactions. Os(VIII)
is more effective as catalyst than Mn04 under catalytic conditions. Suitable
mechanisms have been postulated to explain the kinetics observed in both
the cases.